Solvent for acetyl cellulose.



UNITED STATES PATENT OFFICE.

THEODOR BECKER, ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VOR'M.FRIEDR. BAYER 8; (30., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.-

No Drawing.

Be it knownthat I, Trmonon BECKER, "doctor of philosophy, chemistcitizen of the German Empire, residing at Elberfeld, Germany, have.invented new and useful Imrovements in New Solvents for Acetyl Celulose,of which the following is a specification.

In the treatment of cellulose ester and the production of. solutions forthe manufacture of lacquers or varnishes, photographic films and otherflexible and plastic compounds, I-

have found that dichlorethylene has no or 1 graphic films and other onlyvery low dissolving power for' the cellulose esters which are suitablefor the manufaetureof lacquers or varnishes, photofiexible and plasticcompounds but that conjunction with alcohol, with or without theaddition of other solvents, such as ace-- tone, chlorofornl, etc.,furnishes solutions which are useful for all the purposes defined above.

In order to carry out my invention practically, I- proceed as 'follows,the parts being by weight Example 1: 200 parts of cellulose ester."

4 (produced according to the directions of French Patent No. 371447) aremixed with 650 parts of dichlorethylene and 150 parts of alcohol. Thesolution is allowed to settle and after filtration i's'ready for use.When poured on plates the solvents evaporate and flexible fihns remainbehind.

Example 2: 120 parts of cellulose ester (produced according to thedirections of German Patent No. 159524) are mixedwith 730 parts ofdichlorethylene aud150 parts I of alcohol and slightly heated. Thesolution is employed as described above. V

Example 3: 200 parts of cellulose ester (produced according to thedirections of French Patent No. 371447) are thoroughly moistened with amixture of 150 parts of ethylic alcohol and 400 parts ofdichlorethylene, and 250 parts of acetone. After allowing the mixture.to stand for several 7 Specification of Letters Patent.

dichlorethylene in "soLvnN'r FOR ACETYL oELLULosE.

Patented A r. 11, 1911.

hours it may be kneaded and pressedinto forms, if necessary whilewarming.

1. The process for the manufacture of a solution of cellulose estersconsisting in treating the ester with a mixture of alcohol anddichlorethylene. 2. The process for the manufacture of a solution ofacetylcellulose consisting in treating the ester with a mixtureof'alcohol and dichlorethylene. 3. The process for the manufacture of asolution of cellulose esters consisting in treating the ester with amixture of alcohol and dichlorethylene in the presence of organicsolvents such as have been hitherto employed for dissolving celluloseesters.

4. The process for the manufacture of a solution of acetylcelluloseconsisting in treating the ester with a mixture of alcohol anddichlorethylene in the presence of organic solvents such ashave beenhitherto employed for dissolving acetylcellulose.

5. As a new composition of matter a so-' lution of cellulose esterscomprising dichlorethylen'e and alcohol.

6. As a new com osition of matter a solution of acetylce lulosecomprising dichlorethylene and alcohol.

7. As a new composition of matter a solution of cellulose esterscomprising dichlorethylene, alcohol and organic solvents such ,as havebeen hitherto .employed for dissolving cellulose esters.

8. As a new com osition of matter a solution of acetylcelulose.comprisin dichlorethylene, alcohol and organic so vents such as havebeen hitherto employed for dissolving acetylcellulose.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

Witnesses O'rro Komc, GHAs. J. WRIGHT.

THEODOR BECKER. s v

